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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
28/08/1995 |
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Data da última atualização: |
28/08/1995 |
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Autoria: |
MEDINA, A.; LOPEZ-HERNANDEZ, D. |
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Título: |
Method of desorbing soil phosphate for application to P desorption isotherm construction. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Tropical Agriculture, v.55, n.1, p.69-76, Jan.1978. |
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Idioma: |
Inglês |
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Conteúdo: |
Several methods of extracting phosphate from soils for use in constructing phosphate de-
sorption isotherms were evaluated by applying them to each of four constrating soils. Pre-
paration of the samples for extraction included phosphate addition, both in constant and
in varying amounts. For the former, removal of phosphate was accomplished either by suc-
cessive extractions with 0.02m citric at pH 4.0 (washing isotherms) or by single extractions
with chloride-resin at specific soil/resin ratios. For the latter, desorption was achieved by extracting with (i) citric acid, 0.02 and 0.0025m, respectively (ii) 0.02m KCl at pH 4.0 and (iii) chloride-resin. The isotherms constructed using different soil: resin ratios differentiated
the soils according to their desorption characteristics. Although similar results are obtained
by extracting at various rates of added phosphate, this method is more time consuming and requires more preparatory treatment of the soil sample prior to extraction. Hence, the
traditional method of using a constant rate of phosphate is recommended for assessing la-
bile pool phosphate in different soil types. The effects of the different extractants on phos-
phate desorption is discussed within the framework of the theory of specific adsorptio of
anions on soil and hydrous oxide surface. |
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Palavras-Chave: |
Fertility; Phosphate. |
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Thesagro: |
Fertilidade; Fosfato; Solo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01868naa a2200205 a 4500
001 1785873
005 1995-08-28
008 1978 bl --- 0-- u #d
100 1 $aMEDINA, A.
245 $aMethod of desorbing soil phosphate for application to P desorption isotherm construction.
260 $c1978
520 $aSeveral methods of extracting phosphate from soils for use in constructing phosphate de- sorption isotherms were evaluated by applying them to each of four constrating soils. Pre- paration of the samples for extraction included phosphate addition, both in constant and in varying amounts. For the former, removal of phosphate was accomplished either by suc- cessive extractions with 0.02m citric at pH 4.0 (washing isotherms) or by single extractions with chloride-resin at specific soil/resin ratios. For the latter, desorption was achieved by extracting with (i) citric acid, 0.02 and 0.0025m, respectively (ii) 0.02m KCl at pH 4.0 and (iii) chloride-resin. The isotherms constructed using different soil: resin ratios differentiated the soils according to their desorption characteristics. Although similar results are obtained by extracting at various rates of added phosphate, this method is more time consuming and requires more preparatory treatment of the soil sample prior to extraction. Hence, the traditional method of using a constant rate of phosphate is recommended for assessing la- bile pool phosphate in different soil types. The effects of the different extractants on phos- phate desorption is discussed within the framework of the theory of specific adsorptio of anions on soil and hydrous oxide surface.
650 $asoil
650 $aFertilidade
650 $aFosfato
650 $aSolo
653 $aFertility
653 $aPhosphate
700 1 $aLOPEZ-HERNANDEZ, D.
773 $tTropical Agriculture$gv.55, n.1, p.69-76, Jan.1978.
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Registro original: |
Embrapa Pantanal (CPAP) |
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| Registros recuperados : 1 | |
| 1. |  | MARIANO, R. L. R.; GAMA, M. A. S.; VIANA, F. M. P.; FERREIRA, M. A. V. F.; SOUZA, L. J. N.; SILVEIRA, E. B. Caracterização molecular e patogênica de isolados pigmentados de Xanthomonas associados ao cajueiro. In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 43., Cuiabá, 2010. Tropical Plant Pathology, Lavras, v. 35 (Suplemento), p. S172, 2010. Brasília: Sociedade Brasileira de Fitopatologia, 2010.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| Registros recuperados : 1 | |
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